Figure 3. Electrochemical performances of the as-prepared
electrodes. (a) CV curves of all as-prepared electrodes at a
scan rate of 100 mV s-1. (b) GCD curves of
all as-prepared electrodes at a current density of 1 A
g-1. (c) Nyquist plots measured in the
frequency range 105-0.01 Hz for all as-prepared
electrodes. (d) CV curves generated at the scan rates ranged in
2-100 mV s-1. (e) GCD curves with different
current densities of the ZnO@Mo-Fe-MnO2 NA electrode.(f) Specific capacitance comparison of the as-prepared
electrodes over a current density range of 1–100 A
g-1. (g) The mass, area and volume
capacitances of the as-prepared electrodes at a current density of 1 A
g-1. (h) Capacitance contributions,(i) cycling performance and Coulombic efficiency of the
ZnO@Mo-Fe-MnO2 NA electrode.